Low to High Temperature in Seconds.

I was analyzing a light turning on today at sunset. It was an entrance light of an apartment complex. As the light was turning on, it had a low temperature yellowish color and a few seconds later it turned very white. It was as if the light was heating up and got to a higher temperature color temperature in as little as three seconds. I was amazed at how fast the light changed from a low temperature color to a high temperature color. It reminded me of the day we were in the Video lighting lab and the camera was referencing the different color temperatures as white.